mediate in the central area (Cape Elizabeth to Mt. 

 Desert Island), and lowest in the eastern sector 

 (Mt. Desert Island to Machias Bay). The differences 

 in zooplankton abundance among areas and between 

 years were caused by variations in the timing of 

 vernal warming and coastal differences in water 

 column stability and circulation. 



595. Size, Seasonal Abundance, and Length- 

 Weight Relation of Some Scombrid Fishes 

 from Southeast Florida. By Grant L. Beards- 

 ley, Jr., and William J. Richards. May 1970, 

 iii -t- 6 pp., 5 figs., 2 tables. 



ABSTRACT 

 Seven species of scombrid fishes were sampled for 

 length and weight at a taxidermy firm for 1 year 

 (September 1967-September 1968). These data yield- 

 ed information on size distribution and seasonal 

 abundance of the species off south Florida. In addi- 

 tion, length-weight relations and calculated weights 

 at given lengths are presented. 



596. Fecundity, Multiple Spawning, and Des- 

 cription of the Gonads in Sebastodes. By John 

 S. MacGregor. March 1970, iii + 12 pp., 6 

 figs., 7 tables. 



ABSTRACT 

 More than .50 species of Sebastodes, an ovovivi- 

 parous genus of scorpaenid fishes, occur off the 

 California coast. In the ovaries of nine species 

 examined, evidence of two spawnings per spawn- 

 ing season was found in three (S. ovalis, S. con- 

 stellatits, S. paitcispinis) but not in the other 

 six (S. carnatits, S. rosaceiis, S. serriceps, S. ser- 

 ranoides, S. atrovirens, S. rnberrimns). Two spawn- 

 ings were indicated by either (1) small numbers of 

 advanced larvae entrapped in the ovaries and as- 

 sociated with full complements of developing eggs 

 or early embyros or (2) a secondary group of de- 

 veloping eggs along with about equal numbers of 

 advanced embryos. The relative number of eggs 

 or embryos was lower in the three species that 

 gave evidence of two spawnings (162 eggs or 

 embryos per gram of fish) than in the other six 

 species (280 eggs or embryos per gram offish). 



597. Fur Seal Investigations, 1967. By Marine 

 Mammal Biological Laboratory. March 1970, 

 vii -I- 104 pp., 31 figs., 79 tables. 



ABSTRACT 



Totals of 55,720 male northern fur seals (Cal- 

 lorhhiits iirsiiius) and 10,471 females were killed 

 on the Pribilof Islands in 1967. The predicted kill 

 of males was 56,200. Counts of dead seals on the 

 rookeries included 17,426 pups, 155 adult males, 

 and 185 adult females. Counts of live adult males 

 were 8,876 harem and 5,707 idle. 



Major causes of death amoung 232 pups were 

 malnutrition, liver damage-multiple hemorrhage- 

 perinatal complex, hookworm disease, and infections. 



Thirty-four percent of 1,255 females age 4 and older 

 had given birth to pups. The mean weights of pups 

 from four rookeries differed significantly. Seals 

 tagged included 12,472 pups, 835 yearlings, and 

 1,200 of ages 2 to 4; 115 pups were marked by 

 freeze branding. A total of 5,435 seals tagged on the 

 Pribilof Islands were recovered there in 1967 as 

 were 31 seals tagged by the U.S.S.R. on the Com- 

 mander Islands or on Robben Island. 



.\n estimated 377,000 pups were born on the 

 Pribilof Islands in 1965 and 385,000 in 1967. The 

 estimate of yearling males in 1963 from the 1962 

 year class was 79,000; in 1965 the estimate of 

 yearlings from the 1964 year class was 129,000. The 

 predicted kill of 2 -to 5-year-old males on the Pribilof 

 Islands in 1968 is 49,500. 



An artificial formula supplemented with selenium, 

 vitamin E, methionine, and glycerin, was superior 

 to an unsupplemented formula for maintaining fur 

 seal pups in captivity. 



During pelagic fur seal investigations, seals were 

 most commonly seen within 111 km. (60 nautical 

 miles) of land in January and February, and most 

 were collected off Cape Flattery and westward to 

 La Perouse Bank. Of 835 fur seals sighted off 

 Washington, 131 were collected, 27 were wounded 

 and lost, and 21 were killed and lost. Of 118 female 

 seals collected, 57 percent were gravid; the youngest 

 were three primiparous and one multiparous 5- 

 year-olds. 



Salmonidae (Onckorhynchiis spp.) and Pacific 

 herring (Clupea harengus pallasi) were the principal 

 species eaten by seals off Washington. Shrimp were 

 found for the first time in fur seal stomachs. 



We saw 32 seals and collected 1 during studies of 

 distribution in the Bering Sea and in waters near 

 the eastern Aleutian Islands from 20 November to 

 4 December 1966. 



One of us observed Japanese pelagic fur seal 

 research in April and May 1967. We saw two fur 

 seals off northern California in September and none 

 off Washington and Oregon in August and Septem- 

 ber 1967. 



On the basis of gastrointestinal contents and 

 parasites, 9 of 20 pups had fed on marine organisms 

 while still on the Pribilof Islands. 



598. Published in 1969. 



599. Diagnostic Characters of Juveniles of the 

 Shrimps Pe)iaeiis aztecits aztecns, P. duora- 

 nim duorarum, and P. brasiliensis (Crusta- 

 cea, Decapoda, Penaeidae). By Isabel Perez 

 Farfante. February 1970, iii -I- 26 pp., 25 figs. 



ABSTRACT 

 Illustrated tables are presented for the identi- 

 fication and sex determination of juveniles (with 

 carapace lengths of 8 mm. or more) of three grooved 

 shrimps of the genus Penaeus occurring in various 

 areas along the North American Atlantic coast, in 

 the Gulf of Mexico, and in the Bermudas. Included 



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